Table of contents📚
Writing to a file 📝
Creating a file 📝
First, we need to import some modules to execute operations on files.
use std::fs::File;
use std::io::prelude::*;
To create a file, we will use the File::create method.
let mut file = File::create("hello.txt").expect("Unable to create file");
We specify the name of the file as the first argument.
Now, let’s try to run the program.
$ cargo run
We can now see, in the root of the project, a file called hello.txt.
Writing to a file 📝
Let’s write some text to the file.
For this, we will use the write_all method.
file.write_all(b"Hello world!").expect("Unable to write to file");
The program ignore if a file already exists when creating it.
Inside the write_all method, we add a b before the string to convert it to a byte array because the write_all method only accepts byte arrays.
The write_all method will overwrite the content of the file.
Now if we run the program again, we can see that the file contains the text Hello world!.